Coupling for flexible tubing.



A. SUNDH.

COUPLING FOR FLEXIBLETUBING.

APPLICATION men ocr.22, 1913.

1 139 ,821 I Patented May 18, 1915.

Fg WITNESSES. lNl/E/VTUR 3y ATTORNEY THE NORRIS PEIERS CO., PHOTDLITHO.,WASHINGTON, D, c.

AUGUST SUNDH, 0F 'ZHASTINGS-ULE'ON-HUDSON, NEW YORK.

COUPLING FOR FLEXIBLE TUBING.

Specification of Letters Patent.

Patented Ma is, 1915 Application filed October 22, 1913. Serial No.796,565.

To all whom it may concern:

Be it known that I, AUGUST SUNDH, a cltizen of the United States, and aresident of I-IastingsuponHudson, in the county of ble tubing and itsobject is to provide a simple and eflicient device for this purpose.

I will describe my invention in the following specification and pointout the novel features thereof in appended claims.

Referring to the drawings,Figure l is a longitudinal sectional view ofan improved coupling which embodies my invention, applied to unite twoflexible tubes which are shown partlyin section. Fig. 2 is a transversesection through line A B of Fig.1. Fig. 3 is a side elevation of amodified structure which also embodies my invention. Fig. 4 is afragmentary sectional view of a part of one of my improved couplingsshowing how it may be applied to unitea flexible tube to a pipe. Fig. 5is a plan view partly in section of a mechanism which I use in applyingthe members ofmy coupling to the ends of flexible tubes.

Like characters of reference designate corresponding parts in all of thefigures.

10 designates a flexible tubing such as a flexible armored conduit. Itmaybe made of any prefererd design or construction, such, for example,as that shown and described in a former Patent No. 630,637 which wasissued to me on the 8th day of August 1899. In, the drawings it is shownas constructed of three parts, an inner core ll which may be'made ofsome resilient material such as rubber, and intermediate protectingcover 12 and an outer protecting cover 13 of steel or other suitablematerial.

Referring now to Fig. 5, I will show a device which I use for applyingmy improved coupling to the end of a flexible tubing.

20 designates a screw-clamp of special construction which I have madefor this purpose. It comprises two end frames 21 and 22 which may berigidly held together by means of rods 23, 23. To the end frame 21 atwo-part clamp 24-25 is provided. These two parts are designed totightly fit tube.

over the outside of the tubing to which the coupling is to be applied,and to be bolted together by means of bolts 26 in such a way as tofirmly hold the tube 10 between them. The other end frame22 is providedwith a centrally disposed screw 27 to one end of which a handle or lever28 isapplied, and to the opposite end of which a loose head 29 ofspecial construction is applied.

30 designates one of the outer members of my improved coupling which ispreferably circular in cross-section. It is slipped over the end offlexible tubing 10 into the position in which it is shown in Fig. 5. Itmay be seen that its inner surface is made taper.- ing with its smallestdiameter approxi mately'equal to the outer diameter of the flexibletubing. Consequently, there is a tapering annular space between theinner surface of this outer member and the flexible This annular space31 is then filled with a plastic material. A tapered bushing 32, theinner portion of which is bored out to a' diameter approximately equalto the diameter of the inside diameter of the flexible tubing 10, andthe smallest outside diameter of which is approximately thesame, is thenplaced on the inside of the flexible tubing.

A shoulder 29 of the head 29is designed to.

rest upon the other end of this tapered bushing while another portion 29of the head 29 may be placed within the tapered bushing 32 and serve asa guide to the same and to keep it from crushing when subjected topressure- A. threaded collar 33 is placed on the head 29 as shown. Now,when the parts are in these positions, the screw 27 may be i turned bythe handle 28,and the tapered bushing 32 may thereby be forced into theflexible tubing 10. In doing so it willspread the protective coverings12 and 13 and force them against the inner surface of the outer couplingmember 30. At the same time the plastic material 31 will be displaced bythis action and will be forced under pressure into and between all theopenings which may be'made by the spreading of the protectiye coverings.The threaded bushing 33 will then be screwed into a threaded portion 34:

of the outer coupling member 30. After the 7 parts have thus been forcedtogether and the threaded collar 33 has been screwed into I place, thescrew-clamping device 20 may be removed by unscrewing the bolts 26 andseparating the two clamping parts 24 and 25, and the screw 27 may alsobe backed off.

case the outer flange of the coupling is provided with screw-threads asPIQVl",

ously described, While a similar flange of the opposite coupling member30 need not have such threads out upon it. A threaded outer collar 36 ishowever placed over the coupling member 305 and screwed over thethreaded portion 35 of the coupling member "30 in the mannercommonly-used in pipe coupling membersisjshownf In this case '25 unions.1A packing 37 may be Placedbe V tween the two coupling members 30' and30 I 2 0 if desired. The View. shown in Fig. 2 is of the above method ofuniting thetwo cow 7 I pling members.

In Fig. 3 another method of uniting two the coupling members 30 30 areprovided with flanges35 35 throughwhich bolts, 38' may be passed andarranged to apartssecurely together.

4L1 have shown that'if desired a 7 hold thetwo In Fig. i pipe 40 may besecured directly: onto the threaded flange 35 of the couplingfmember V'30: I Thisgfigure also shows that the-inside of the threaded collar 33'may also be threaded as isishown at 33 and if this is done, a pipe 41'may be secured directly into i the threaded collar 53. as is also shownin Fig. 4.

I When the flexible tubing is connected in i the above describedmannerit maybeused in many ways such for example, as a protective conduit forelectrical conductors or ffor steam pipes, or for the purpose of carry-'ingoif the exhaust gases from explosive eni of use. It is believed that'a coupling of i I have shown several modifications of thls invention inorder to show that itis not limited to anyone construction or methodthis nature is broadly new and I. therefore do not mean to impose othe'rlimitations 7 thanthose in the appended claims.

What I claim is: I 1. A coupling for flexible tubingcomprising anexternalmember having a. conically. shaped interior adapted. to beplaced over the end of. the tubing, a conically shaped bushing adaptedto fit into the tubing and arranged to be forced into'the tubing underpressure to expand said tubing against the V inner surface of saidexternal member and a plastic material between said external.

i member and the internalbushing.

2. A coupling for flexible tubingcomprising an external member having aconically shaped interior adapted to be placed over the end of thetubing, a conically shaped bushing. adapted to fitinto the tubing andarranged to beforced intothe tubing under pressure,to expand said tubingagainst the inner surface of said external member, a

plastic material between said external meme ber and the internal bushingand a threaded bushing arranged to securely hold said parts together. ip

3. A coupling for flexible tubing compris ing an external member havingaconically the end of the tubing, a conically shaped shapedinterioradapted to be placed over" bushing adapted to lfit into thetubing and Iarranged to be forced into the tubing under pressure to expand saidtubing against the plasticmaterial between said external meminnersurface of said external member, a

ber and the internal'bushing and a threaded 1 V bushing arranged to holdsaid parts securely together, said externalmember being pro-.

vided with means for attaching said member to another external member.

4. A coupling for flexible tubing compris ,ing an external member havinga conically shaped interior adapted to be placed over the end of the,tubing, a conically shaped 7 Jbushing adapted to fit into the tubing andarranged to be forced into the tubing under pressure to expand saidtubing against the inner surface of said external member, a

plastic material between said external 'mem ber and the internalbushing, and a threaded bushing arranged to hold the parts securelytogether, said external member being pro vided with screw-threads withwhich said threaded bushingjengages.

5. A coupling for flexible tubing comprising a pairof externalmembers'each having a conically shaped interior adapted to be placedover the respective ends of the tubing, a pair of conicallyfshapedbushings each adapted to fit into the tubing within one of said externalmembers and arranged to .be forced into the tubing under pressure toexpand the tubing against the inner surface of itsrespective I externalmember, a

plastic material between said external mem bers and the. internalbushings, threaded bushings arranged to securely hold said parts,together and means for attaching the two external members together...

6. A coupling for flexible tubing comprising a pair. of externalmembers, each having a conically shaped interior adapted to be placedoverthe respective ends ofthe tubeach adapted to fit intothetubingwithin one of said external members and arranged to be forced intothe'tubing under pressure to expand the tubing against the inner suring,a pair ofconically shaped bushings,

face of its respective external'member, a

plastic material between said external members and. the internalbushings, threaded. bushings arranged to securely .hold, said partstogether, one of said external mem- In Witness whereof, I have hereuntoset blers belaing pfrovhged with sfre -tlgreadi andmy hand this 21st dayof October 1913. he 0t er 0 sai externa mem ers eing provided With athreaded collar adapted to AUGUST SUNDH' 5 fit into the screw-threads ofthe first memr Witnesses:

her to securely hold the two external mem- JAMES G. BETHELL, berstogether. WALTER G. STRANG.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,.

, Washington, D. 0.

